We are working on some new features related to ECMAScript 6, and I think that the current versioning scheme is not serving us well.
I propose that we create the following plan:
Rhino 2.0.0 will have ECMAScript 6 compliance, whenever we can get there. In this version, the default language version would be "VERSION_ES_6."
Rhino 1.9.0 will be the next version (successor to 1.7R5pre4). It will include partial ES 6 features that can be enabled by setting the language version, but they would be off by default unless the version is set. The default version would be VERSION_1_8.
Additional versions could be created at 1.9.1, 1.9.2, and so on, and we will abandon the "pre" designation.
This way the Rhino version number is decoupled from the language version number.
Please let me know what you think about this...